1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/aio.h> 35 #include <sys/domain.h> 36 #include <sys/file.h> 37 #include <sys/filedesc.h> 38 #include <sys/kernel.h> 39 #include <sys/kthread.h> 40 #include <sys/malloc.h> 41 #include <sys/proc.h> 42 #include <sys/protosw.h> 43 #include <sys/sigio.h> 44 #include <sys/signal.h> 45 #include <sys/signalvar.h> 46 #include <sys/socket.h> 47 #include <sys/socketvar.h> 48 #include <sys/filio.h> /* XXX */ 49 #include <sys/sockio.h> 50 #include <sys/stat.h> 51 #include <sys/sysctl.h> 52 #include <sys/sysproto.h> 53 #include <sys/taskqueue.h> 54 #include <sys/uio.h> 55 #include <sys/ucred.h> 56 #include <sys/un.h> 57 #include <sys/unpcb.h> 58 #include <sys/user.h> 59 60 #include <net/if.h> 61 #include <net/if_var.h> 62 #include <net/route.h> 63 #include <net/vnet.h> 64 65 #include <netinet/in.h> 66 #include <netinet/in_pcb.h> 67 68 #include <security/mac/mac_framework.h> 69 70 #include <vm/vm.h> 71 #include <vm/pmap.h> 72 #include <vm/vm_extern.h> 73 #include <vm/vm_map.h> 74 75 static SYSCTL_NODE(_kern_ipc, OID_AUTO, aio, CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 76 "socket AIO stats"); 77 78 static int empty_results; 79 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, empty_results, CTLFLAG_RD, &empty_results, 80 0, "socket operation returned EAGAIN"); 81 82 static int empty_retries; 83 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, empty_retries, CTLFLAG_RD, &empty_retries, 84 0, "socket operation retries"); 85 86 static fo_rdwr_t soo_read; 87 static fo_rdwr_t soo_write; 88 static fo_ioctl_t soo_ioctl; 89 static fo_poll_t soo_poll; 90 extern fo_kqfilter_t soo_kqfilter; 91 static fo_stat_t soo_stat; 92 static fo_close_t soo_close; 93 static fo_fill_kinfo_t soo_fill_kinfo; 94 static fo_aio_queue_t soo_aio_queue; 95 96 static void soo_aio_cancel(struct kaiocb *job); 97 98 struct fileops socketops = { 99 .fo_read = soo_read, 100 .fo_write = soo_write, 101 .fo_truncate = invfo_truncate, 102 .fo_ioctl = soo_ioctl, 103 .fo_poll = soo_poll, 104 .fo_kqfilter = soo_kqfilter, 105 .fo_stat = soo_stat, 106 .fo_close = soo_close, 107 .fo_chmod = invfo_chmod, 108 .fo_chown = invfo_chown, 109 .fo_sendfile = invfo_sendfile, 110 .fo_fill_kinfo = soo_fill_kinfo, 111 .fo_aio_queue = soo_aio_queue, 112 .fo_flags = DFLAG_PASSABLE 113 }; 114 115 static int 116 soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 117 int flags, struct thread *td) 118 { 119 struct socket *so = fp->f_data; 120 int error; 121 122 #ifdef MAC 123 error = mac_socket_check_receive(active_cred, so); 124 if (error) 125 return (error); 126 #endif 127 error = soreceive(so, 0, uio, 0, 0, 0); 128 return (error); 129 } 130 131 static int 132 soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 133 int flags, struct thread *td) 134 { 135 struct socket *so = fp->f_data; 136 int error; 137 138 #ifdef MAC 139 error = mac_socket_check_send(active_cred, so); 140 if (error) 141 return (error); 142 #endif 143 error = sousrsend(so, NULL, uio, NULL, 0, NULL); 144 return (error); 145 } 146 147 static int 148 soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred, 149 struct thread *td) 150 { 151 struct socket *so = fp->f_data; 152 int error = 0; 153 154 switch (cmd) { 155 case FIONBIO: 156 SOCK_LOCK(so); 157 if (*(int *)data) 158 so->so_state |= SS_NBIO; 159 else 160 so->so_state &= ~SS_NBIO; 161 SOCK_UNLOCK(so); 162 break; 163 164 case FIOASYNC: 165 if (*(int *)data) { 166 SOCK_LOCK(so); 167 so->so_state |= SS_ASYNC; 168 if (SOLISTENING(so)) { 169 so->sol_sbrcv_flags |= SB_ASYNC; 170 so->sol_sbsnd_flags |= SB_ASYNC; 171 } else { 172 SOCK_RECVBUF_LOCK(so); 173 so->so_rcv.sb_flags |= SB_ASYNC; 174 SOCK_RECVBUF_UNLOCK(so); 175 SOCK_SENDBUF_LOCK(so); 176 so->so_snd.sb_flags |= SB_ASYNC; 177 SOCK_SENDBUF_UNLOCK(so); 178 } 179 SOCK_UNLOCK(so); 180 } else { 181 SOCK_LOCK(so); 182 so->so_state &= ~SS_ASYNC; 183 if (SOLISTENING(so)) { 184 so->sol_sbrcv_flags &= ~SB_ASYNC; 185 so->sol_sbsnd_flags &= ~SB_ASYNC; 186 } else { 187 SOCK_RECVBUF_LOCK(so); 188 so->so_rcv.sb_flags &= ~SB_ASYNC; 189 SOCK_RECVBUF_UNLOCK(so); 190 SOCK_SENDBUF_LOCK(so); 191 so->so_snd.sb_flags &= ~SB_ASYNC; 192 SOCK_SENDBUF_UNLOCK(so); 193 } 194 SOCK_UNLOCK(so); 195 } 196 break; 197 198 case FIONREAD: 199 SOCK_RECVBUF_LOCK(so); 200 if (SOLISTENING(so)) { 201 error = EINVAL; 202 } else { 203 *(int *)data = sbavail(&so->so_rcv) - so->so_rcv.sb_ctl; 204 } 205 SOCK_RECVBUF_UNLOCK(so); 206 break; 207 208 case FIONWRITE: 209 /* Unlocked read. */ 210 if (SOLISTENING(so)) { 211 error = EINVAL; 212 } else { 213 *(int *)data = sbavail(&so->so_snd); 214 } 215 break; 216 217 case FIONSPACE: 218 /* Unlocked read. */ 219 if (SOLISTENING(so)) { 220 error = EINVAL; 221 } else { 222 if ((so->so_snd.sb_hiwat < sbused(&so->so_snd)) || 223 (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) { 224 *(int *)data = 0; 225 } else { 226 *(int *)data = sbspace(&so->so_snd); 227 } 228 } 229 break; 230 231 case FIOSETOWN: 232 error = fsetown(*(int *)data, &so->so_sigio); 233 break; 234 235 case FIOGETOWN: 236 *(int *)data = fgetown(&so->so_sigio); 237 break; 238 239 case SIOCSPGRP: 240 error = fsetown(-(*(int *)data), &so->so_sigio); 241 break; 242 243 case SIOCGPGRP: 244 *(int *)data = -fgetown(&so->so_sigio); 245 break; 246 247 case SIOCATMARK: 248 /* Unlocked read. */ 249 if (SOLISTENING(so)) { 250 error = EINVAL; 251 } else { 252 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 253 } 254 break; 255 default: 256 /* 257 * Interface/routing/protocol specific ioctls: interface and 258 * routing ioctls should have a different entry since a 259 * socket is unnecessary. 260 */ 261 if (IOCGROUP(cmd) == 'i') 262 error = ifioctl(so, cmd, data, td); 263 else if (IOCGROUP(cmd) == 'r') { 264 CURVNET_SET(so->so_vnet); 265 error = rtioctl_fib(cmd, data, so->so_fibnum); 266 CURVNET_RESTORE(); 267 } else { 268 CURVNET_SET(so->so_vnet); 269 error = so->so_proto->pr_control(so, cmd, data, 0, td); 270 CURVNET_RESTORE(); 271 } 272 break; 273 } 274 return (error); 275 } 276 277 static int 278 soo_poll(struct file *fp, int events, struct ucred *active_cred, 279 struct thread *td) 280 { 281 struct socket *so = fp->f_data; 282 #ifdef MAC 283 int error; 284 285 error = mac_socket_check_poll(active_cred, so); 286 if (error) 287 return (error); 288 #endif 289 return (sopoll(so, events, fp->f_cred, td)); 290 } 291 292 static int 293 soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred) 294 { 295 struct socket *so = fp->f_data; 296 int error = 0; 297 298 bzero((caddr_t)ub, sizeof (*ub)); 299 ub->st_mode = S_IFSOCK; 300 #ifdef MAC 301 error = mac_socket_check_stat(active_cred, so); 302 if (error) 303 return (error); 304 #endif 305 SOCK_LOCK(so); 306 if (!SOLISTENING(so)) { 307 struct sockbuf *sb; 308 309 /* 310 * If SBS_CANTRCVMORE is set, but there's still data left 311 * in the receive buffer, the socket is still readable. 312 */ 313 sb = &so->so_rcv; 314 SOCK_RECVBUF_LOCK(so); 315 if ((sb->sb_state & SBS_CANTRCVMORE) == 0 || sbavail(sb)) 316 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 317 ub->st_size = sbavail(sb) - sb->sb_ctl; 318 SOCK_RECVBUF_UNLOCK(so); 319 320 sb = &so->so_snd; 321 SOCK_SENDBUF_LOCK(so); 322 if ((sb->sb_state & SBS_CANTSENDMORE) == 0) 323 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 324 SOCK_SENDBUF_UNLOCK(so); 325 } 326 ub->st_uid = so->so_cred->cr_uid; 327 ub->st_gid = so->so_cred->cr_gid; 328 if (so->so_proto->pr_sense) 329 error = so->so_proto->pr_sense(so, ub); 330 SOCK_UNLOCK(so); 331 return (error); 332 } 333 334 /* 335 * API socket close on file pointer. We call soclose() to close the socket 336 * (including initiating closing protocols). soclose() will sorele() the 337 * file reference but the actual socket will not go away until the socket's 338 * ref count hits 0. 339 */ 340 static int 341 soo_close(struct file *fp, struct thread *td) 342 { 343 int error = 0; 344 struct socket *so; 345 346 so = fp->f_data; 347 fp->f_ops = &badfileops; 348 fp->f_data = NULL; 349 350 if (so) 351 error = soclose(so); 352 return (error); 353 } 354 355 static int 356 soo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 357 { 358 struct sockaddr_storage ss = { .ss_len = sizeof(ss) }; 359 struct inpcb *inpcb; 360 struct unpcb *unpcb; 361 struct socket *so; 362 int error; 363 364 kif->kf_type = KF_TYPE_SOCKET; 365 so = fp->f_data; 366 CURVNET_SET(so->so_vnet); 367 kif->kf_un.kf_sock.kf_sock_domain0 = 368 so->so_proto->pr_domain->dom_family; 369 kif->kf_un.kf_sock.kf_sock_type0 = so->so_type; 370 kif->kf_un.kf_sock.kf_sock_protocol0 = so->so_proto->pr_protocol; 371 kif->kf_un.kf_sock.kf_sock_pcb = (uintptr_t)so->so_pcb; 372 switch (kif->kf_un.kf_sock.kf_sock_domain0) { 373 case AF_INET: 374 case AF_INET6: 375 if (so->so_pcb != NULL) { 376 inpcb = (struct inpcb *)(so->so_pcb); 377 kif->kf_un.kf_sock.kf_sock_inpcb = 378 (uintptr_t)inpcb->inp_ppcb; 379 } 380 kif->kf_un.kf_sock.kf_sock_rcv_sb_state = 381 so->so_rcv.sb_state; 382 kif->kf_un.kf_sock.kf_sock_snd_sb_state = 383 so->so_snd.sb_state; 384 kif->kf_un.kf_sock.kf_sock_sendq = 385 sbused(&so->so_snd); 386 kif->kf_un.kf_sock.kf_sock_recvq = 387 sbused(&so->so_rcv); 388 break; 389 case AF_UNIX: 390 if (so->so_pcb != NULL) { 391 unpcb = (struct unpcb *)(so->so_pcb); 392 if (unpcb->unp_conn) { 393 kif->kf_un.kf_sock.kf_sock_unpconn = 394 (uintptr_t)unpcb->unp_conn; 395 kif->kf_un.kf_sock.kf_sock_rcv_sb_state = 396 so->so_rcv.sb_state; 397 kif->kf_un.kf_sock.kf_sock_snd_sb_state = 398 so->so_snd.sb_state; 399 kif->kf_un.kf_sock.kf_sock_sendq = 400 sbused(&so->so_snd); 401 kif->kf_un.kf_sock.kf_sock_recvq = 402 sbused(&so->so_rcv); 403 } 404 } 405 break; 406 } 407 error = sosockaddr(so, (struct sockaddr *)&ss); 408 if (error == 0 && 409 ss.ss_len <= sizeof(kif->kf_un.kf_sock.kf_sa_local)) { 410 bcopy(&ss, &kif->kf_un.kf_sock.kf_sa_local, ss.ss_len); 411 } 412 ss.ss_len = sizeof(ss); 413 error = sopeeraddr(so, (struct sockaddr *)&ss); 414 if (error == 0 && 415 ss.ss_len <= sizeof(kif->kf_un.kf_sock.kf_sa_peer)) { 416 bcopy(&ss, &kif->kf_un.kf_sock.kf_sa_peer, ss.ss_len); 417 } 418 strncpy(kif->kf_path, so->so_proto->pr_domain->dom_name, 419 sizeof(kif->kf_path)); 420 CURVNET_RESTORE(); 421 return (0); 422 } 423 424 /* 425 * Use the 'backend3' field in AIO jobs to store the amount of data 426 * completed by the AIO job so far. 427 */ 428 #define aio_done backend3 429 430 static STAILQ_HEAD(, task) soaio_jobs; 431 static struct mtx soaio_jobs_lock; 432 static struct task soaio_kproc_task; 433 static int soaio_starting, soaio_idle, soaio_queued; 434 static struct unrhdr *soaio_kproc_unr; 435 436 static int soaio_max_procs = MAX_AIO_PROCS; 437 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, max_procs, CTLFLAG_RW, &soaio_max_procs, 0, 438 "Maximum number of kernel processes to use for async socket IO"); 439 440 static int soaio_num_procs; 441 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, num_procs, CTLFLAG_RD, &soaio_num_procs, 0, 442 "Number of active kernel processes for async socket IO"); 443 444 static int soaio_target_procs = TARGET_AIO_PROCS; 445 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, target_procs, CTLFLAG_RD, 446 &soaio_target_procs, 0, 447 "Preferred number of ready kernel processes for async socket IO"); 448 449 static int soaio_lifetime; 450 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, lifetime, CTLFLAG_RW, &soaio_lifetime, 0, 451 "Maximum lifetime for idle aiod"); 452 453 static void 454 soaio_kproc_loop(void *arg) 455 { 456 struct proc *p; 457 struct vmspace *myvm; 458 struct task *task; 459 int error, id, pending; 460 461 id = (intptr_t)arg; 462 463 /* 464 * Grab an extra reference on the daemon's vmspace so that it 465 * doesn't get freed by jobs that switch to a different 466 * vmspace. 467 */ 468 p = curproc; 469 myvm = vmspace_acquire_ref(p); 470 471 mtx_lock(&soaio_jobs_lock); 472 MPASS(soaio_starting > 0); 473 soaio_starting--; 474 for (;;) { 475 while (!STAILQ_EMPTY(&soaio_jobs)) { 476 task = STAILQ_FIRST(&soaio_jobs); 477 STAILQ_REMOVE_HEAD(&soaio_jobs, ta_link); 478 soaio_queued--; 479 pending = task->ta_pending; 480 task->ta_pending = 0; 481 mtx_unlock(&soaio_jobs_lock); 482 483 task->ta_func(task->ta_context, pending); 484 485 mtx_lock(&soaio_jobs_lock); 486 } 487 MPASS(soaio_queued == 0); 488 489 if (p->p_vmspace != myvm) { 490 mtx_unlock(&soaio_jobs_lock); 491 vmspace_switch_aio(myvm); 492 mtx_lock(&soaio_jobs_lock); 493 continue; 494 } 495 496 soaio_idle++; 497 error = mtx_sleep(&soaio_idle, &soaio_jobs_lock, 0, "-", 498 soaio_lifetime); 499 soaio_idle--; 500 if (error == EWOULDBLOCK && STAILQ_EMPTY(&soaio_jobs) && 501 soaio_num_procs > soaio_target_procs) 502 break; 503 } 504 soaio_num_procs--; 505 mtx_unlock(&soaio_jobs_lock); 506 free_unr(soaio_kproc_unr, id); 507 kproc_exit(0); 508 } 509 510 static void 511 soaio_kproc_create(void *context, int pending) 512 { 513 struct proc *p; 514 int error, id; 515 516 mtx_lock(&soaio_jobs_lock); 517 for (;;) { 518 if (soaio_num_procs < soaio_target_procs) { 519 /* Must create */ 520 } else if (soaio_num_procs >= soaio_max_procs) { 521 /* 522 * Hit the limit on kernel processes, don't 523 * create another one. 524 */ 525 break; 526 } else if (soaio_queued <= soaio_idle + soaio_starting) { 527 /* 528 * No more AIO jobs waiting for a process to be 529 * created, so stop. 530 */ 531 break; 532 } 533 soaio_starting++; 534 mtx_unlock(&soaio_jobs_lock); 535 536 id = alloc_unr(soaio_kproc_unr); 537 error = kproc_create(soaio_kproc_loop, (void *)(intptr_t)id, 538 &p, 0, 0, "soaiod%d", id); 539 if (error != 0) { 540 free_unr(soaio_kproc_unr, id); 541 mtx_lock(&soaio_jobs_lock); 542 soaio_starting--; 543 break; 544 } 545 546 mtx_lock(&soaio_jobs_lock); 547 soaio_num_procs++; 548 } 549 mtx_unlock(&soaio_jobs_lock); 550 } 551 552 void 553 soaio_enqueue(struct task *task) 554 { 555 556 mtx_lock(&soaio_jobs_lock); 557 MPASS(task->ta_pending == 0); 558 task->ta_pending++; 559 STAILQ_INSERT_TAIL(&soaio_jobs, task, ta_link); 560 soaio_queued++; 561 if (soaio_queued <= soaio_idle) 562 wakeup_one(&soaio_idle); 563 else if (soaio_num_procs < soaio_max_procs) 564 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task); 565 mtx_unlock(&soaio_jobs_lock); 566 } 567 568 static void 569 soaio_init(void) 570 { 571 572 soaio_lifetime = AIOD_LIFETIME_DEFAULT; 573 STAILQ_INIT(&soaio_jobs); 574 mtx_init(&soaio_jobs_lock, "soaio jobs", NULL, MTX_DEF); 575 soaio_kproc_unr = new_unrhdr(1, INT_MAX, NULL); 576 TASK_INIT(&soaio_kproc_task, 0, soaio_kproc_create, NULL); 577 } 578 SYSINIT(soaio, SI_SUB_VFS, SI_ORDER_ANY, soaio_init, NULL); 579 580 static __inline int 581 soaio_ready(struct socket *so, struct sockbuf *sb) 582 { 583 return (sb == &so->so_rcv ? soreadable(so) : sowriteable(so)); 584 } 585 586 static void 587 soaio_process_job(struct socket *so, sb_which which, struct kaiocb *job) 588 { 589 struct ucred *td_savedcred; 590 struct thread *td; 591 struct sockbuf *sb = sobuf(so, which); 592 #ifdef MAC 593 struct file *fp = job->fd_file; 594 #endif 595 size_t cnt, done, job_total_nbytes __diagused; 596 long ru_before; 597 int error, flags; 598 599 SOCK_BUF_UNLOCK(so, which); 600 aio_switch_vmspace(job); 601 td = curthread; 602 retry: 603 td_savedcred = td->td_ucred; 604 td->td_ucred = job->cred; 605 606 job_total_nbytes = job->uiop->uio_resid + job->aio_done; 607 done = job->aio_done; 608 cnt = job->uiop->uio_resid; 609 job->uiop->uio_offset = 0; 610 job->uiop->uio_td = td; 611 flags = MSG_NBIO; 612 613 /* 614 * For resource usage accounting, only count a completed request 615 * as a single message to avoid counting multiple calls to 616 * sosend/soreceive on a blocking socket. 617 */ 618 619 if (sb == &so->so_rcv) { 620 ru_before = td->td_ru.ru_msgrcv; 621 #ifdef MAC 622 error = mac_socket_check_receive(fp->f_cred, so); 623 if (error == 0) 624 625 #endif 626 error = soreceive(so, NULL, job->uiop, NULL, NULL, 627 &flags); 628 if (td->td_ru.ru_msgrcv != ru_before) 629 job->msgrcv = 1; 630 } else { 631 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 632 flags |= MSG_MORETOCOME; 633 ru_before = td->td_ru.ru_msgsnd; 634 #ifdef MAC 635 error = mac_socket_check_send(fp->f_cred, so); 636 if (error == 0) 637 #endif 638 error = sousrsend(so, NULL, job->uiop, NULL, flags, 639 job->userproc); 640 if (td->td_ru.ru_msgsnd != ru_before) 641 job->msgsnd = 1; 642 } 643 644 done += cnt - job->uiop->uio_resid; 645 job->aio_done = done; 646 td->td_ucred = td_savedcred; 647 648 if (error == EWOULDBLOCK) { 649 /* 650 * The request was either partially completed or not 651 * completed at all due to racing with a read() or 652 * write() on the socket. If the socket is 653 * non-blocking, return with any partial completion. 654 * If the socket is blocking or if no progress has 655 * been made, requeue this request at the head of the 656 * queue to try again when the socket is ready. 657 */ 658 MPASS(done != job_total_nbytes); 659 SOCK_BUF_LOCK(so, which); 660 if (done == 0 || !(so->so_state & SS_NBIO)) { 661 empty_results++; 662 if (soaio_ready(so, sb)) { 663 empty_retries++; 664 SOCK_BUF_UNLOCK(so, which); 665 goto retry; 666 } 667 668 if (!aio_set_cancel_function(job, soo_aio_cancel)) { 669 SOCK_BUF_UNLOCK(so, which); 670 if (done != 0) 671 aio_complete(job, done, 0); 672 else 673 aio_cancel(job); 674 SOCK_BUF_LOCK(so, which); 675 } else { 676 TAILQ_INSERT_HEAD(&sb->sb_aiojobq, job, list); 677 } 678 return; 679 } 680 SOCK_BUF_UNLOCK(so, which); 681 } 682 if (done != 0 && (error == ERESTART || error == EINTR || 683 error == EWOULDBLOCK)) 684 error = 0; 685 if (error) 686 aio_complete(job, -1, error); 687 else 688 aio_complete(job, done, 0); 689 SOCK_BUF_LOCK(so, which); 690 } 691 692 static void 693 soaio_process_sb(struct socket *so, sb_which which) 694 { 695 struct kaiocb *job; 696 struct sockbuf *sb = sobuf(so, which); 697 698 CURVNET_SET(so->so_vnet); 699 SOCK_BUF_LOCK(so, which); 700 while (!TAILQ_EMPTY(&sb->sb_aiojobq) && soaio_ready(so, sb)) { 701 job = TAILQ_FIRST(&sb->sb_aiojobq); 702 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 703 if (!aio_clear_cancel_function(job)) 704 continue; 705 706 soaio_process_job(so, which, job); 707 } 708 709 /* 710 * If there are still pending requests, the socket must not be 711 * ready so set SB_AIO to request a wakeup when the socket 712 * becomes ready. 713 */ 714 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 715 sb->sb_flags |= SB_AIO; 716 sb->sb_flags &= ~SB_AIO_RUNNING; 717 SOCK_BUF_UNLOCK(so, which); 718 719 sorele(so); 720 CURVNET_RESTORE(); 721 } 722 723 void 724 soaio_rcv(void *context, int pending) 725 { 726 struct socket *so; 727 728 so = context; 729 soaio_process_sb(so, SO_RCV); 730 } 731 732 void 733 soaio_snd(void *context, int pending) 734 { 735 struct socket *so; 736 737 so = context; 738 soaio_process_sb(so, SO_SND); 739 } 740 741 void 742 sowakeup_aio(struct socket *so, sb_which which) 743 { 744 struct sockbuf *sb = sobuf(so, which); 745 746 SOCK_BUF_LOCK_ASSERT(so, which); 747 748 sb->sb_flags &= ~SB_AIO; 749 if (sb->sb_flags & SB_AIO_RUNNING) 750 return; 751 sb->sb_flags |= SB_AIO_RUNNING; 752 soref(so); 753 soaio_enqueue(&sb->sb_aiotask); 754 } 755 756 static void 757 soo_aio_cancel(struct kaiocb *job) 758 { 759 struct socket *so; 760 struct sockbuf *sb; 761 long done; 762 int opcode; 763 sb_which which; 764 765 so = job->fd_file->f_data; 766 opcode = job->uaiocb.aio_lio_opcode; 767 if (opcode & LIO_READ) { 768 sb = &so->so_rcv; 769 which = SO_RCV; 770 } else { 771 MPASS(opcode & LIO_WRITE); 772 sb = &so->so_snd; 773 which = SO_SND; 774 } 775 776 SOCK_BUF_LOCK(so, which); 777 if (!aio_cancel_cleared(job)) 778 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 779 if (TAILQ_EMPTY(&sb->sb_aiojobq)) 780 sb->sb_flags &= ~SB_AIO; 781 SOCK_BUF_UNLOCK(so, which); 782 783 done = job->aio_done; 784 if (done != 0) 785 aio_complete(job, done, 0); 786 else 787 aio_cancel(job); 788 } 789 790 static int 791 soo_aio_queue(struct file *fp, struct kaiocb *job) 792 { 793 struct socket *so; 794 struct sockbuf *sb; 795 sb_which which; 796 int error; 797 798 so = fp->f_data; 799 error = so->so_proto->pr_aio_queue(so, job); 800 if (error == 0) 801 return (0); 802 803 /* Lock through the socket, since this may be a listening socket. */ 804 switch (job->uaiocb.aio_lio_opcode & (LIO_WRITE | LIO_READ)) { 805 case LIO_READ: 806 SOCK_RECVBUF_LOCK(so); 807 sb = &so->so_rcv; 808 which = SO_RCV; 809 break; 810 case LIO_WRITE: 811 SOCK_SENDBUF_LOCK(so); 812 sb = &so->so_snd; 813 which = SO_SND; 814 break; 815 default: 816 return (EINVAL); 817 } 818 819 if (SOLISTENING(so)) { 820 SOCK_BUF_UNLOCK(so, which); 821 return (EINVAL); 822 } 823 824 if (!aio_set_cancel_function(job, soo_aio_cancel)) 825 panic("new job was cancelled"); 826 TAILQ_INSERT_TAIL(&sb->sb_aiojobq, job, list); 827 if (!(sb->sb_flags & SB_AIO_RUNNING)) { 828 if (soaio_ready(so, sb)) 829 sowakeup_aio(so, which); 830 else 831 sb->sb_flags |= SB_AIO; 832 } 833 SOCK_BUF_UNLOCK(so, which); 834 return (0); 835 } 836